Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods, excluding the amniotes. All extant (living) amphibians belong to the monophyletic subclass Lissamphibia, with three living orders: Anura (frogs), Urodela (salamanders), and Gymnophiona (caecilians). Evolved to be mostly semiaquatic, amphibians have adapted to inhabit a wide variety of habitats, with most species living in freshwater, wetland or terrestrial ecosystems. Their life cycle typically starts out as aquatic larvae with gills known as tadpoles, but some species have developed behavioural adaptations to bypass this.
Caecilians are a group of limbless, vermiform (worm-shaped) or serpentine (snake-shaped) amphibians with small or sometimes nonexistent eyes. They mostly live hidden in soil or in streambeds, and this cryptic lifestyle renders caecilians among the least familiar amphibians. Modern caecilians live in the tropics of South and Central America, Africa, and southern Asia. Caecilians feed on small subterranean creatures such as earthworms. The body is cylindrical and often darkly coloured, and the skull is bullet-shaped and strongly built. Caecilian heads have several unique adaptations, including fused cranial and jaw bones, a two-part system of jaw muscles, and a chemosensory tentacle in front of the eye. The skin is slimy and bears ringlike markings or grooves and may contain scales.
Gegeneophis ramaswamii, common names Tenmalai caecilian, Tenmalai blind caecilian, Ramaswami's caecilian, and forest caecilian is a species of caecilian. It is endemic to the southern portion of the Western Ghats, India, and is recorded from Kerala and Tamil Nadu. The specific name ramaswamii honours L. S. Ramaswami, an Indian herpetologist.
The Western Ghats in India are home to several species of caecilians (Gymnophiona). Caecilians are legless, burrowing amphibians which mostly live in leaf litter, loose soil, under rocks and decaying logs. They are also found in agricultural fields and only surface during the monsoon. The body is elongated and smooth with a slimy skin. The smaller caecilians superficially resemble earthworms while the larger ones are often mistaken for snakes. However, they can be told apart from earthworms by the presence of eyes, teeth and skeleton and from snakes by the lack of scales on skin. The eyes in caecilians are not well developed which is most likely to be because of their burrowing life style. They are considered as rare which is apparently due to their subterranean habits. To see them one has to search carefully and be at the right place and at the right time. There are few places where they are common, but, at least one species was reported to be abundant in agricultural fields in Kerala. The larger caecilians can resemble snakes, but their skin is smooth, not scaly.
Boulengerula changamwensis, the Changamwe caecilian, is a species of amphibian in the family Herpelidae. It is also known as Changamwensis African caecilian and Changamwe lowland caecilian. It is found in southern Kenya and Malawi, and possibly in the intervening Tanzania and Mozambique.
Dermophis mexicanus, also known commonly as the Mexican burrowing caecilian or the Mexican caecilian, and locally as the tapalcua or tepelcua, is a species of limbless amphibian in the family Dermophiidae. The species is native to Mexico and Central America, where it burrows under leaf litter and plant debris.
Dermophis occidentalis is a species of caecilian in the family Dermophiidae. It is endemic to south-western Costa Rica and occurs in the Pacific lowlands and premontane slopes, extending to the western part of the central valley. Its taxonomic status is unclear.
Mimosiphonops reinhardti is a species of caecilian in the family Siphonopidae. It is endemic to Brazil. It is only known from the holotype collected from "Brasilia" in 1878, probably somewhere in eastern Brazil. The specific name reinhardti honors Johannes Theodor Reinhardt, Danish zoologist and herpetologist who collected the holotype. Common name Reinhardt's caecilian has been proposed for this species.
Oscaecilia bassleri, also known as the Pastaza River caecilian, is a species of caecilian in the family Caeciliidae. It is known from the lower Amazonian slopes and western Amazon Basin in Ecuador and Peru, but its range might extend into Bolivia and Colombia. The specific name bassleri honors Harvey Bassler, an American geologist and paleontologist.
Schistometopum thomense is a species of amphibian in the family Dermophiidae, endemic to São Tomé and Ilhéu das Rolas. It is found in most soils on São Tomé, from tropical moist lowland forests to coastal coconut plantations. It is absent only from the driest northern areas of the island. It is typically around 30 cm (12 in) in length, and is often bright yellow. The size of S. thomense can vary throughout São Tomé, however, and it is the only known caecilian to follow Bergmann's rule, which states that a decreasing temperature due to factors such as increasing altitude will cause an increase in the body size of endothermic vertebrate species. The island of São Tomé is a massive shield volcano, and it therefore has differing altitudes throughout the island, potentially resulting in the size diversity of S. thomense. This species may be referred to as the São Tomé caecilian, as the Agua Ize caecilian, or as the island caecilian, or by the local name of cobra bobo.
Siphonops annulatus, the ringed caecilian, is a species of caecilian in the family Siphonopidae from South America. It might have the broadest known distribution among terrestrial caecilian species.
Siphonops hardyi, or Hardy's caecilian, is a species of caecilian in the family Siphonopidae. It is endemic to southeastern Brazil where it occurs in the states of São Paulo, Rio de Janeiro, Espírito Santo, and Minas Gerais, possibly wider. This species lives in soil and under leaf litter or stones in primary forest, plantations, and rural gardens. It is a common species; it can locally suffer from infrastructure development but is not generally threatened.
Siphonops leucoderus, the Salvador caecilian, is a species of caecilian in the family Siphonopidae. It is endemic to eastern Brazil and only known from its type locality, the Bahia state. It is assumed to be a subterranean species, possibly living in lowland moist forest.
Siphonops paulensis, or Boettger's caecilian, is a species of caecilian in the family Siphonopidae. It is found in northern Argentina, Paraguay, eastern Bolivia, and southern Brazil. It lives subterraneously in forests, savannas, shrublands, and grassland. It also adapts to anthropogenic disturbance and can even live in urban gardens. In fact these caecilians have even been recorded to breed and raise their young close to Santa Cruz, a highly populated city. It is a locally common species that is not facing major threats.
Scolecomorphus kirkii is a species of caecilian in the family Scolecomorphidae. It is known from southern Malawi east of the Shire River, northern Mozambique, and Tanzania ; the known distribution is discontinuous but the species is expected to occur in the intervening areas.
Rhynchonkos is an extinct genus of rhynchonkid microsaur. Originally known as Goniorhynchus, it was renamed in 1981 because the name had already been given to another genus; the family, likewise, was originally named Goniorhynchidae but renamed in 1988. The type and only known species is R. stovalli, found from the Early Permian Fairmont Shale in Cleveland County, Oklahoma. Rhynchonkos shares many similarities with Eocaecilia, an early caecilian from the Early Jurassic of Arizona. Similarities between Rhynchonkos and Eocaecilia have been taken as evidence that caecilians are descendants of microsaurs. However, such a relationship is no longer widely accepted.
The Siphonopidae are the family of common caecilians. They are found in Central and South America. Like other caecilians, they superficially resemble worms or snakes.
Labidiaster annulatus, the Antarctic sun starfish or wolftrap starfish is a species of starfish in the family Heliasteridae. It is found in the cold waters around Antarctica and has a large number of slender, flexible rays.
Matriphagy is the consumption of the mother by her offspring. The behavior generally takes place within the first few weeks of life and has been documented in some species of insects, nematode worms, pseudoscorpions, and other arachnids as well as in caecilian amphibians.
